Fastening elements for sliding fasteners of the invisible type



Dec. 20, 1955 A. CAMPRUBI PLANAS 2,727,290

FASTENING ELEMENTS FOR SL NG FASTENERS OF THE ISIBLE PE Filed April 1952INVENTOR. .4. Ckazppafizj lamo Y 0V v I United States Patent FASTENINGELEMENTS FOR SLIDING FAS- TENERS OF THE INVISIBLE TYPE Alberto CamprubiPlanes, Sabadell, Spain Application April 22, 1952, Serial No. 283,549Claims priority, application Spain February 23, 1952 1 Claim. (Cl.24-20513) The present invention relates to improvements in fasteningelements for sliding fasteners of the invisible type.

Fastening elements for sliding fasteners of the kind referred to arewell known wherein the said elements, either symmetric or not, have tobe arranged for working at the one side and at the opposite, thus therebeing provided right hand and left hand elements. These are symmetric ornot in itself, but the ones with respect to the others in the oppositeside are not alike but symmetric in the arrangement of the linkingtooth.

Such an arrangement means a duplicity of machinery in the manufactureand stringing of said elements in order to form the sliding fasteners,as it is obvious that there has to be some variations in order to obtainthe elements for both the sides and for the stringing thereof, due towhich fact, setting up an industry of that kind is expensive incomparison with that for the manufacture of single elements for commonsliding fasteners.

It has been found that providing the linking tooth not only on one ofthe element arms but in the contrary too, there will result, on eachfastening element, two linking teeth protruding from one and the sameface thereof, the suitable recesses formed in the operation for themanufacture of the said teeth being left in the opposite face.

With the fastening elements arranged in such a manner, the same arelikewise applicable to both the sides of the fastener, thus doing awaywith the necessity of elements for the right hand side and elements forthe left hand side, and both the kinds of elements are reduced to asingle one that definitely answers the purpose of both the sides of thefastener.

This feature which at first view may appear to be only important to thefastener is, however, transcendent for the manufacture thereof as thenumber of machines involved in its fabrication and to form the invisiblesliding fastener is reduced to the half. At present, there are machinesof two different kinds for the manufacture of the fastener elements, onefor the elements of the right hand side and another for the elements ofthe left hand side, and stringing of the elements has to be performedonto different tapes, one for each side of the fastener, etc.

The present invention makes it possible that the manufacture of thestandardized elements can be performed by a single machine and theutilization of a single tape, and a single machine for the stringingthereof onto a tape.

The elements fixed onto a tape will, thus, be identically arranged, andas a characteristic feature to define which side of the fastener theyhave to be applied to, it is only necessary to iron the tape towards theright or left side of the elements in order to thereby obtain, ofcourse, the invisible sliding fastener.

In order that the nature and scope of the present invention may beclearly understood, reference is made to the following detaileddescription, taken in consideration with the accompanying sheet ofdrawings showing a single embodiment only by way of example.

In the drawings:

Fig. 1 shows diverse embodiments of fastening elements;

Fig. 2 is a view of the element taken from the lower edge thereof;

Fig. 3 shows a fastening element fixed onto a tape, and in dotted linesthe tape bent to the other side, and

Fig. 4 is a transversal section of a plurality of elements forming thesliding fastener, in linked arrangement.

With reference to Fig. 1, as parts of the element are indicated the body1, the arms 2 and 3, the section 4 having the smallest resistance andthe development arch 5 which once the element is fixed to the tape givesplace to a straight edge and, finally, the linking teeth 6 arranged oneach arm, thus resulting in two linking teeth on each fastening element.

The element so arranged is strung onto the tape 10 by means of asymmetrical clamping action, thus giving place to clamping of theelement against the thickened edge 8 as is shown in Fig. 3.

The element is provided in the face opposite to that which has the teethwith recesses 7 obtained in the formation of the same, by means of whichperfect linking is obtained either on one side or on the opposite withrespect to the above referred teeth 6.

The tape with the fastener elements secured thereon may be ironed orpressed towards one side (full lines in Fig. 3) or towards the oppositeside (dotted lines in Fig. 3).

The linking of the fastener is clearly appreciated in Fig. 4, whereineach tooth 6 engages with the recess 7 of the opposite element, thesimilar elements 1 thus remaining forming the invisible slidingfastener, which as may be appreciated is deprived of a definite flank,there not being elements for the right hand side and different elementsfor the left hand side, but a single type of element with thecorresponding simplification which this fact allows to in the industryof the referred invisible sliding fasteners.

The invention may be carried into practice in other embodimentsdifiering in its detail from those given only as a way of illustrativeexample for the preceding description and to which the claimedprotection will likewise extend. It may, thus, be fabricated in anyshape and size, utilizing in the manufacture thereof the materials mostsuitable to each case of embodiment, combined in the most convenient wayto reach the proposed end as all this will be comprehended within thespirit of the present claim.

Once described and ascertained the nature of my said invention and inwhat manner the same is to be performed, I declare that what I claim is:

Improvements in separable fasteners of the invisible type including aflat tape having a bead along one edge and a set of fastening elements,each element comprising a body portion of elongated form provided withan opening intermediate the ends thereof with the opening extending fromone edge to substantially the opposite edge to define a longitudinallyweakened edge, the said opening also providing a similar arm at each endof the. body portion on opposite sides of the opening with such armsextending outwardly at an angle to the longitudinally weakened edge, alinking tooth on each arm extending parallel to the sides of the arm,with each tooth protruding from the same face of the respective arms,each arm having on its opposite face, a recess corresponding to saidtooth and extending parallel to the sides of the arm, the said teeth andrecesses being substantially in line with the opening in the bodyportion, the upper end of each arm being inclined downwardly to theopening so that p 4 siieH end'oftlfie zirrii form" a trough-likedepression, with References Cited in the file of this patent the end'ofeach arm remotefrom the opening being UNITED TATES PATENT rounded andthe bead on the tape being insertable into 7 A5 b S I S the opening sothat when pressure is applied to the ends 3 E 1937 at tlie'bddy'portion;tli'e'respe'ctive arms; are moved-1i 5 3,120,924 Suns? Welg June 14)1938 ward each other by virtne of thelong'ittidinall'y weakened "401,313Morm, f 5- June 41 1946 edge of the body portion to anchor the ta'p'eb'eadin the 2,483,057 Levermg SePt- 1949 opening with one edge of thesaid tape overlying at FOREIGN PATENTS 7 least one arm of the bodyportion and to displace the 323,199; Italy: of 1934 teetli' an'drec'esses to a' position perpendicular to the 10 longitudinally weakenededge of the body portion.

